Razor blade plane



April 1953 A. w. MILTENBURG 2,636,529

RAZOR BLADE PLANE Filed Jan. 9. 1947 I l' I /o H'x 43 I v I 4 35 40 4 I; I4 47 Fig. 3. 1 1 9 INVENTOR. Hen/0e 14 MMJ''A/8U86 M5 m, M *M arr-anal! Patented Apr. 28, 1953 RAZOR BLADE PLANE Arthur Miltenburg, Milwaukee, Wis. Application January 9, 1951;; Serial no". 221,096 g 1 Claim. (or-14555) My invention relates to improvements in blade holders for planes, chisels and the like.

The object of my invention is to provide means whereby a razor blade or equivalent thin, resilient cutting element may be securely clamped to a holding plate adapted to serve as the blade holder of a plane, or as the handle of a chisel.

In the following description reference is had to the accompanying drawings, in which Figure 1 is a plan view of a plane body of my invention, with the blade holder partially broken away.

Figure 2 is a sectional view drawn to line 2-2 of Figure 1.

Figure 3 is a detail view of the upper surface of the blade holding plate.

Figure 4 is a view of the under surface of said plate. 1

Figure 5 is an enlarged fragmentary sectional view of a holder and blade drawn to a modification of plane shown in Figure 2.

Like parts are identified by the same reference characters throughout the several views.

A thin steel shaving blade, preferably of the safety razor blade type shown at In in Figure 2, is clamped to the under surface of one end portion of a fiat handle like holder The latter is recessed at l2 and the end portion of the blade distant from its cutting edge I3 is closely fitted to this recess and held therein by a clamping plate l4 also fitted to an extension |5 of the recess [2 in which it is held by a bolt l6 extending through the plate I4 and the holder H for threaded engagement with a thumb nut on" the exposedior upper side of the plate. When the nut is turned to clamping position, the head l8 of the bolt draws the plate l4 toward the holder and forces the engaged portion of the blade into the recess l2 to securely clamp it to the holder. If the blade'has a thick back as indicated at 20, the recess [2 is deepened to receive it and the contour of the under surface 22 of the end portion of the holder determines the position of the blade cutting edge relative to the holder.

The blade shown in Figure'2 may be assumed to be a safety razor blade of a well known type having but one cutting edge l3.

In Figure 5 a blade 26 is illustrated which is thin throughout its length and apertured at 27,

whereby a correspondingly apertured clamping plate '28 may be used to bind it to the holder. In this construction one or more bolts 29 extend through the plate 28, the holes 21 in the blade 26 and through the holder to receive the thumb nuts 30.

1 If-desired, the lower marginal-portion'3lof the'plate 28;may. be given aslight upward curve and the under surface 32 of the lower end portion of'the holder may be correspondingly curved whereby when the clamping pressure is applied by the thumb nuts the blade will be flexed and the position of its cutting edge relative to the holder and clamping plate edges precisely determined. In Figure 2 and also in Figure 5 the cutting edge of the blade is preferably ground to a one way bevel.

In either case, the holder, blade and clamping means constitute a unit which may be separately used as a chisel-like tool, or may be secured to the body of a plane in the manner now to be described.

As usual in smoothing planes thestock or body has a rectangular bottom portion 40 provided with a transverse slot 4|, and an upwardly extending rear portion or bed 42, which serves as a holder support, and the front face 43 of which has a downward and forward inclination to the slot 4|. The holder may be secured to the upper portoin of this surface by a screw 44 which passes through a key hole slot 43 in the holder. The head of the screw has a diameter greater than the narrow portion of the slot, but less than its larger portion, and the slot is so located, and its narrow portion is of such length that the cutting edge of the blade may be adjusted precisely to a cutting position of projection through the slot 4|.

As best shown in Fig. 5, the slanting portion of the plane stock 40 to the immediate rear of the transverse slot 4|, hereinafter referred to as the slot back or blade support, provides a blade supporting surface 35 deviating from the projected inclined plane of the holder support or bed 42 upon which rests the holder II which mounts the blade 26. As best shown in Figs. 1, 2 and 5 the forward edge 36 of the holder II, in normal adjusted position, overlaps the upper edge of the blade support 35 whereby to firmly hold the thin blade 26 flexed against the blade support 35. The lap of the holder edge over the blade support also acts to firmly seat the thin blade against the blade support to prevent chatter and the like.

The slot 4| is flanked by side flanges 46 which connect the front and rear portions of the body. The inclined face 43 of the plane body is recessed at 47 to receive the clampin plate 28. Otherwise the surface 43 may conform to that of the holder and the blade against which it bears. In Figure 2 the surface 43 is similarly recessed to receive the clamping plate H. The plane body and the holding plate II, when combined, constitute a holder for blades of the general type shown in Figures 2 and 5.

I claim:

In a razor blade plane, the combinatioziwith a stock having a transverse slot opening to its lower face and having a transversely channeled bed portion comprising upperand lower surfaces separated by the channel and inclined: toward portion channel and having a rear margin sea-ted upon the step of the plate within its said channel and; a forward margin underlapping the deeper portion of said downwardly opening: plate. channot, a threaded bolt. connected with said jawand projecting upwardly through said plate, a wing nuton the bolt and bearing on said plate, and a razor blade resting on the lower surface of the bed portion with its edge projecting through the slo-tof the stock, said blade having a back along 5 itsupper margin disposed in part in each of the channels of the bed portion and plate and clamped to the plate by said jaw and having an intermediate portion clamped by the plate to said lower bed portion surface. 10' ARTHUR. W. MIUIENBURG.

References Cited in the file of this patent UNITED STATES PATENTS i Number 7 Name Date l.-,l92,849 Bridges Aug. 1, 1916 $87,529 Blackmer Mar. 18, 1924 1,496,295 Chance June 3, 1924 1,574,725 Basmaison Feb. 23, 1926 2 1,587,746 Basmaison June 8, 1926 1,623,644 Tvedt Apr. 5, 1927 1,553,642 Stanley Sept. 15, 1927 2,494,455 Soldani Jan; 10, 1 950 

